Mitsubishi Electric ECOV-X37VA Manuel D'installation page 49

11. Test run
11-1. To ensure proper test run
Check if the wiring work has been done properly.
After wiring work, be sure to measure the insulation resis-
tance between the cable run and ground, and that between
each wire with a high voltage insulation megger tester to
check that the resistance is 1 MΩ or more. (Do not measure
the insulation resistance of the controller to prevent damage
to the electronic circuit boards.)
After checking that the installation work has been done prop-
erly, power ON the main switch (earth leakage breakers etc.).
Check the phase order of the power supply and the inter-
phase voltage. If the voltage is out of the ±10% range, or if the
voltage imbalance is more than 2%, discuss the countermea-
sure with the customer.
11-2. Setting the pressure switch <high pressure>
1) The unit is equipped with a pressure switch <high pressure> in the refrigerant circuit as a safety device. The
default values of the switch are fixed and unchangeable.
2) Do not change the settings or do not replace the switch.
3) The default values of the pressure switch <compressor discharge pressure> are as follows.
Safety device
Pressure switch <compressor discharge
pressure>: 63H
The crankcase heater that is used for preventing the foaming
of lubricating oil is powered only when the compressor is
stopped.
Before starting up the unit after leaving it alone more than
half a day with its main switch OFF, energize the unit at least
3 hours to heat the lubricating oil.
Fully open the refrigerant service valve.
Make sure that the compressor or fan is generating no abnor-
mal noise or vibration. When there is any abnormality, imme-
diately stop and inspect the unit.
After the operation becomes stable, check that the operation
pressure and the temperature of each device are in the prop-
er range. Refer to "Checking the unit condition". (Page 52)
Default setting value (MPa)
OFF ON
12.0 8.5
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